In the first quarter of Oklahoma City's 106-77 win over Cleveland on Sunday, the Thunder had already managed to build a big lead. Winning 29-13, Oklahoma City guard James Harden got a defensive rebound and ran a fast break. The 21-year-old took the ball all the way to the basket and slammed a one-handed dunk over Cavaliers forward J.J. Hickson. Scroll down to watch the video.